更新AOSP内置系统应用程序

Question

Lets say we have downloaded, built and flashed AOSP source code. Now a change to a system app is made (eg changed a constant in the packages/apps/Nfc package).

The next step is to build it, and there are two ways to do it:

cd packages/apps/Nfc; mm

or

mmm Nfc

This will create out/target/product//system/app/NfcNci/NfcNci.apk file

Which is the proper way to update the system app?

I tried using adb install NfcNci.apk but no success:

~/android/aosp-7.1.2-3.10-v2/out/target/product/kugo/system/app/NfcNci$ adb install NfcNci.apk
Failed to install NfcNci.apk: Failure [INSTALL_FAILED_ALREADY_EXISTS: Attempt to re-install com.android.nfcnci without first uninstalling.]
~/android/aosp-7.1.2-3.10-v2/out/target/product/kugo/system/app/NfcNci$ adb install -r NfcNci.apk
Failed to install NfcNci.apk: Failure [INSTALL_FAILED_INVALID_APK: Package couldn't be installed in /data/app/com.android.nfcnci-1: Package /data/app/com.android.nfcnci-1/base.apk code is missing]

Answer 1

Found a way to easily 're-install' the app itself (let's put Settings app as an example):

mmm packages/apps/Settings  # Build the module
adb root ; adb remount  # Restart adbd as root and mount /system as writable
adb push out/target/product/<device_name>/system/priv-app/Settings /system/priv-app  # Push the built files to the device

Then force-close and restart the app (by swiping it from Recents ). No need to reboot device in order to take changes

NOTE: Depending on the app, the path may be on system/app instead of /system/priv-app

Answer 2

Another way is to:

1. copy the new apk to the sdcard of the device with adb push
2. mount /system read write: mount -o rw,remount,rw /system
3. copy your new .apk from /sdcard over your old .apk in /system/app
4. remove the .odex file of your old .apk
5. reboot the device

For development you can use a simple script for this steps.

Answer 3

Check build/envsetup.sh file - there's also commands mmp and mmmp to build and push a module to connected device. Also adb sync can be used to sync whole image, so if you updated a module, changed files will be pushed to device.

Also you can put the changed files via regular `adb push' and reboot device.

I do not know if system apps can be updated via adb install , probably yes, but I think you need to increment build number in the manifest file.

I do not think you can uninstall a system app with adb install -r , as apps can't be removed from system partition, only from data . I do not know why you are getting INSTALL_FAILED_INVALID_APK in that case, may be because app manager can't uninstall the base system apk indeed.